′�?, by using a frequency of 295 cm−one, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption from the 295 cm−1 phonon corresponds to the crystal IR absorption edge, instead of the residual absorption peak. Density functional theory computations exhibit the residual absorption of the BGSe crystal https://baga4se7-crystal74063.blogthisbiz.com/39293148/the-ultimate-guide-to-baga4se7-crystal